Do you have your own Smarthome devices and do you want to integrate that into you Google Home?
Then you are at the right place!
1. Add devices
2. Add Queries which Google uses to check device state
3. Add Execution which is used to turn on and off you device
4. Add SmarterIOT app in Google Assistent app (at Home -> (+) -> again (+) setup device -> Link existing device -> choose SmarterIOT)
5. Control your device by saying: Ok Google, turn on [device name]